IOWA ACADEMY OP SCIENCE y 
Exhibit of Photographs of Delicate Marine Animals Taken Prom Life in Sea Water 
C. C. Nutting 
A Study in Wing Vernation, Family Aphididae C. E. Bartholomew 
Protective Adaptations in the Nesting Habits of Some Central American Birds. M. E. Peck 
Revival of an Old Method of Brain Dissection H. J. Hoeve 
Physiographic Significance of the Mesa De Maya C. R. Keyes 
Tertiary Terranes of New Mexico C. R. Keyes 
Volcanic Phenomena About Citlaltepetl and Popocatapetl C. R. Keyes 
